Reactjs Gatsby-未定义IntersectionObserver
我正试图建立我的盖茨比项目,但我不能,因为IntersectionObserver没有被认可。我在InView组件中使用intersectionObserver:Reactjs Gatsby-未定义IntersectionObserver,reactjs,gatsby,polyfills,intersection-observer,Reactjs,Gatsby,Polyfills,Intersection Observer,我正试图建立我的盖茨比项目,但我不能,因为IntersectionObserver没有被认可。我在InView组件中使用intersectionObserver: import React, { useRef, useState, useEffect } from 'react' const InView = ({ children }) => { const [boundingClientY, setBoundingClientY] = useState(null)
import React, { useRef, useState, useEffect } from 'react'
const InView = ({ children }) => {
const [boundingClientY, setBoundingClientY] = useState(null)
const [direction, setDirection] = useState(null)
const [element, setElement] = useState(null)
const [inView, setInView] = useState(false)
const observer = useRef(new IntersectionObserver((entries) => {
const first = entries[0]
const { boundingClientRect } = first
first.isIntersecting && setInView(true)
!first.isIntersecting && setInView(false)
boundingClientRect.y > boundingClientY && setDirection('down')
boundingClientRect.y < boundingClientY && setDirection('up')
boundingClientY && setBoundingClientY(first.boundingClientRect.y)
}))
useEffect(() => {
const currentElement = element
const currentObserver = observer.current
currentElement && currentObserver.observe(currentElement)
// console.log(currentObserver)
return () => {
currentElement && currentObserver.unobserve(currentElement)
};
}, [element])
const styles = {
opacity: inView ? 1 : 0,
transform: `
translateY(${!inView ?
direction === 'up' ? '-20px' : '20px'
: 0})
rotateY(${!inView ? '35deg' : 0})
scale(${inView ? 1 : 0.9})
`,
transition: 'all 0.4s ease-out 0.2s'
}
return (
<div ref={setElement} style={styles}>
{children}
</div>
)
}
export default InView
import React,{useRef,useState,useffect}来自“React”
const InView=({children})=>{
常量[boundingClientY,setBoundingClientY]=useState(null)
const[direction,setDirection]=useState(null)
常量[element,setElement]=useState(null)
const[inView,setInView]=useState(false)
const observer=useRef(新的IntersectionObserver((条目)=>{
const first=条目[0]
常量{boundingClientRect}=first
first.isIntersecting&&setInView(true)
!first.isIntersecting&&setInView(false)
boundingClientRect.y>boundingClientY&&setDirection('down'))
boundingClientRect.y{
常量currentElement=元素
const currentObserver=observer.current
currentElement&¤tObserver.observe(currentElement)
//console.log(currentObserver)
return()=>{
currentElement&¤tObserver.unobserve(currentElement)
};
},[元素])
常量样式={
不透明度:inView?1:0,
转换:`
translateY(${!查看?
方向===“向上”?“-20px”:“20px”
: 0})
rotateY(${!inView?'35deg':0})
比例(${inView?1:0.9})
`,
过渡:“所有0.4缓解0.2”
}
返回(
{儿童}
)
}
导出默认视图
我为根元素提供了一个包装器来启用全局状态,并尝试在gatsby-browser.js中导入polyfill:
import React from 'react'
import GlobalContextProvider from './src/components/context/globalContextProvider'
export const wrapRootElement = ({ element }) => {
return (
<GlobalContextProvider>
{element}
</GlobalContextProvider>
)
}
export const onClientEntry = async () => {
if (typeof IntersectionObserver === `undefined`) {
await import(`intersection-observer`);
}
}
从“React”导入React
从“./src/components/context/GlobalContextProvider”导入GlobalContextProvider
导出常量wraproteElement=({element})=>{
返回(
{element}
)
}
export const onclientry=async()=>{
if(IntersectionObserver的类型==`undefined`){
等待导入(`intersection observer`);
}
}
这是一个构建错误,对吧($gatsby build)?如果是这种情况,这与浏览器支持无关
事实上,IntersectionObserver
是一个浏览器API,在服务器端渲染期间不应使用浏览器API。相反,您尝试在安装组件后使用它们。要解决此问题,请在useffect()
中初始化观察者,而不是像当前那样在useRef()
中初始化观察者
...
const observer = useRef();
useEffect(() => {
observer.current = new IntersectionObserver({ ... });
}, []); // do this only once, on mount
...